Spring Boot多个模块考虑在配置中定义类型的bean

Question

我有一个多模块Spring-boot应用程序，我有两个子模块：

• 弹簧引导REST的API，待办事项列表
• 坚持

组织如下：

持久性模块

<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>tutorials</artifactId>
        <groupId>com.medkhelifi</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <artifactId>persistence</artifactId>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb</artifactId>
        </dependency>
    </dependencies>

spring-boot-rest-api-todo-list模块

<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>tutorials</artifactId>
        <groupId>com.medkhelifi</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>spring-boot-rest-api-todo-list</artifactId>
    <packaging>war</packaging>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <start-class>com.medkhelifi.tutorials.springboot.restapi.todolist.RestTodoListApplication</start-class>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb</artifactId>
        </dependency>

        <dependency>
            <groupId>com.medkhelifi</groupId>
            <artifactId>persistence</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
    </dependencies>

    <build>
        <finalName>spring-boot-rest-api-todo-list</finalName>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <artifactId>maven-war-plugin</artifactId>
                <configuration>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

在我的rest-api模块中，我想扫描两个模块（持久性和restapi），我这样继续：

@SpringBootApplication
@ComponentScan ({"com.medkhelifi.tutorials.springboot", "com.medkhelifi.tutorials.persistence"})
public class RestTodoListApplication  {
    @Autowired
    private UserRepository userRepository;

    public static void main (String[] args){
        SpringApplication.run(RestTodoListApplication.class, args);
    }
}

但我得到了这个错误：

Field userRepository in com.medkhelifi.tutorials.springboot.restapi.todolist.RestTodoListApplication required a bean of type 'com.medkhelifi.tutorials.persistence.model.repositories.UserRepository' that could not be found.

Action:

Consider defining a bean of type 'com.medkhelifi.tutorials.persistence.model.repositories.UserRepository' in your configuration.

如果我从ComponentScan中删除"com.medkhelifi.tutorials.spring-boot"，则错误消失，但我的restapi模块下的控制器将无法正常工作。

我尝试了很多ComponentScan的变种，但是出现了同样的错误：

@ComponentScan ({"com.medkhelifi.tutorials"})
@ComponentScan ({"com.medkhelifi.tutorials.persistence", "com.medkhelifi.tutorials.springboot"})

Answer 1

我想我找到了解决方案，我添加了@EnableMongoRepositories来扫描我的持久性模块：

@EnableMongoRepositories(basePackages = "com.medkhelifi.tutorials.persistence")

Answer 2

Spring正试图寻找Autowired依赖，但它并没有在任何地方找到它。

尝试添加此：

@EnableJpaRepositories（{ “com.medkhelifi.WhereverYourRepoIs”}）

如果我没弄错的话你需要告诉Spring Boot在哪里找到你的回购，特别是如果他们在与@SpringBootApplication不同的模块中。

Answer 3

您在主应用程序类中发生的自动接线，您没有将其作为组件扫描的基础包提供。试试这个

@ComponentScans(value = { @ComponentScan("com.medkhelifi.tutorials"),
        @ComponentScan("com.medkhelifi.tutorials.persistence"), @ComponentScan("com.medkhelifi.tutorials.restapi") })

要么

@ComponentScan(value = {"com.medkhelifi.tutorials",
        "com.medkhelifi.tutorials.persistence", "com.medkhelifi.tutorials.restapi" })